Well, for me and for others, all of that didn't work.Information for those who are interested.
I couldn't answer before - I was busy.
(I use the plugin version the same as on the site)
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When activating the "Delete Unused CSS" function, you need to wait for time for the page definition process. After that, refresh the page to create a cache (screenshot -1).
The path to the folder on the site (file manager) where files are generated and stored:
/public_html/wp-content/cache/used-css/1
(screenshot - 2).
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And now for the loud ones (tango):
You need to be able to use the plugin, and not raise a shout on the site (The folder is empty - there are no files!).
Or maybe something else is empty?
I'm getting the folders created (same as in your screenshots) but they are EMPTY (no contents).
Also, in the source code of the website I'm not seeing <style id="wpr-usedcss"> (which doesn't appear in your website's source code either
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